controller: Fix element-type annotations
controller: Fix element-type annotations

justinjoy/gstreamer,StreamUtils/gstreamer,collects/gstreamer,mparis/gstreamer,shelsonjava/gstreamer,lubosz/gstreamer,justinjoy/gstreamer,krieger-od/gstreamer,justinjoy/gstreamer,krichter722/gstreamer,lovebug356/gstreamer,mparis/gstreamer,lovebug356/gstreamer,lubosz/gstreamer,ensonic/gstreamer,cablelabs/gstreamer,cablelabs/gstreamer,Lachann/gstreamer,ensonic/gstreamer,StreamUtils/gstreamer,StreamUtils/gstreamer,surround-io/gstreamer,cfoch/gstreamer,mparis/gstreamer,krieger-od/gstreamer,cablelabs/gstreamer,shelsonjava/gstreamer,surround-io/gstreamer,jpakkane/gstreamer,shelsonjava/gstreamer,centricular/gstreamer,StreamUtils/gstreamer,centricular/gstreamer,shelsonjava/gstreamer,lubosz/gstreamer,centricular/gstreamer,collects/gstreamer,krichter722/gstreamer,mparis/gstreamer,centricular/gstreamer,ensonic/gstreamer,justinjoy/gstreamer,jpxiong/gstreamer,cablelabs/gstreamer,cfoch/gstreamer,jpakkane/gstreamer,cfoch/gstreamer,cablelabs/gstreamer,krieger-od/gstreamer,shelsonjava/gstreamer,justinjoy/gstreamer,jpakkane/gstreamer,jpakkane/gstreamer,Lachann/gstreamer,krieger-od/gstreamer,surround-io/gstreamer,mparis/gstreamer,krichter722/gstreamer,lovebug356/gstreamer,lovebug356/gstreamer,krichter722/gstreamer,jpxiong/gstreamer,Lachann/gstreamer,Lachann/gstreamer,jpxiong/gstreamer,collects/gstreamer,surround-io/gstreamer,jpakkane/gstreamer,collects/gstreamer,StreamUtils/gstreamer,cfoch/gstreamer,ensonic/gstreamer,lubosz/gstreamer,surround-io/gstreamer,jpxiong/gstreamer,lubosz/gstreamer,jpxiong/gstreamer,Lachann/gstreamer,collects/gstreamer,krichter722/gstreamer,centricular/gstreamer,cfoch/gstreamer,ensonic/gstreamer,lovebug356/gstreamer,krieger-od/gstreamer